Monitoring daily activity and load of human activity is important for maintaining health and preventing life-style related diseases or sudden death from overwork. We can evaluate quantitative activity and load with multiple sensors attached to the human body. In this study, we created a prototype system for measuring environmental conditions, including ambient temperature, pressure, humidity, and three-dimensional acceleration (shock) sensing devices, using MEMS technology. The prototype can continually monitor and record environmental conditions and provide the history of the body's activity and environmental load quantitatively. In this paper, we detail the system configuration and characteristics, and provide the examples of measured data.